'Yellow colored solenoid' signal coming up on dashboard

Ever since my return from Fiat Plant Visit in Pune, I have faced this problem.

The car was sent in for 45000km service at COncorde, Dairy Circle towards Dec end. Mr. Khan a very able guy diagnosed the problem to be a faulty coil, (there are 4 of them on the front side when you open the black plastic cover). Out of these 4, the last one going from left -to-right, was at fault. It was replaced with a new one. THen again it failed around end of Jan & got it changed on 2nd/3rd Feb. But once again I'm facing this problem for the past 2days.